Are you the first owner?
other than looking on Ebay for a supertrapp or other used Lc4/SXC pipe I don't know what to tell you.
sorry, good luck.

No, I'm the second owner.

But the guy I bought it from was the first owner - he claims he never touched thing on the bike, and I have reason to believe him.

It's totally stock, even has the "Read the Maual Before Riding this Motorcycle" sticker still on the fender. By the way the exhaust also has a catalytic converter on it, halfway betrween muffler and header.